Thermodynamic analysis and optimisation of a novel transcritical CO_2 cycle

Zahurul Haq; Shaumik Rahman Ayon; Waheduzzaman Bosunia NoumanRaghav Bihani

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Thermodynamic analysis and optimisation of a novel transcritical CO_2 cycle

机译：Thermodynamic analysis and optimisation of a novel transcritical CO_2 cycle

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Transcritical and supercritical CO_2 cycles are simple, low-cost, environmentally friendly, and compact solutions for harnessing a wide range of thermal energy sources such as waste heat, solar-thermal, geothermal, and nuclear reactors. In a supercritical CO, cycle, compression begins near the critical-state (30.98 ℃ and 7.3773 MPa), whereas CO_2 condensation occurs below the critical-state in a transcritical CO_2 cycle, and the required sink temperatures are difficult to attain in the hot arid climates. The current study presents and optimises a novel transcritical CO_2 power cycle that can be used in hot climates and offers very compact system which is vital for engine waste heat recovery. The proposed system achieves CO_2 condensation by expanding pre-cooled CO_2 from some intermediate pressure. It uses phase-wise CO_2 separation in the separator and two recuperators to recycle waste heat from the hot CO_2 stream leaving the turbine, reducing heat input into the heater and heat rejection by the pre-cooler. To achieve the best thermal efficiency, a differential evolution optimisation is used, and the phase-wise split of CO_2 is tuned to provide excellent matching of temperature profiles while achieving the required pinch-point conditions in both the recuperators, resulting in a minimal low exergy destruction. The maximum thermal efficiency of the proposed cycle is 39.82%, while the optimal supercritical recuperative-Brayton cycle offers efficiency of 37.77%, under the same initial conditions. Under optimal current cycle conditions, thermodynamic processes avoid operating close to the CO_2 critical point, necessitating less demanding and simpler turbomachinery designs.

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来源
《Energy conversion & management》 |2022年第12期|116407.1-116407.14|共14页
作者
Zahurul Haq; Shaumik Rahman Ayon; Waheduzzaman Bosunia NoumanRaghav Bihani;
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作者单位

Department of Mechanical Engineering, Bangladesh University of Engineering & Technology (BUET), Dhaka 1000, Bangladesh;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
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关键词
Transcritical CO_2 cycle; Thermodynamic analysis; Differential evolution optimisation; Exergy utilisation; Performance analysis; Heat-exchanger performance;

Thermodynamic analysis and optimisation of a novel transcritical CO_2 cycle

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